Support no cache and pull options for dockerized --build

[boukeversteegh]

No description provided.

[boukeversteegh]

@danielrolfes2307 @drolfes

This feature was quite simple to implement. Could you check out this branch, and see if it works the way you expected?

Suggested method of running:

# unix
DOCKERIZED_ROOT=$PWD go run main.go --build --no-cache --pull <COMMAND>

or

# powershell
$env:DOCKERIZED_ROOT = $(Get-Location) ; go run main.go --build --no-cache --pull <COMMAND>

Fixes #52

[danielrolfes2307]

@boukeversteegh
Awesome...Will try later and give feedback :)

[boukeversteegh]

By the way, this PR does not include your request of running build without run, so the main question is whether the flags actually work as expected.

[danielrolfes2307]

@boukeversteegh
Sorry for the late reply. I tested it and it works as expected :)